Add FriendlyId gem
Use FriendlyId on url field in Round model
Merge branch 'friendly_id'
Convert spec file to javascript
Remove one last javascript file
Remove coffeescript gem
Add JBuilder gem
Force second only precision in Round expire_time

Since Postgres doesn't store milisecond precision, while Rails'
TimeWithZone class can, comparing a record that has come from the
database with one that was just created will fail.
Add Rounds API controller
Force content type to json

Required because the partials change the content type to html. Once
those are removed this won't be a problem.
Check status via rounds api instead of round_status
RoundsController -> RoundController with plural resource
Use resourceful routing for Round#show
Use named routes
Only expect round data from round api
Simply return status in round#charge
Use Rails4 finders
Use Ruby 2 style hash syntax
Move donation creation to Api::DonationsController
Use friendly_id finder